One of the DPS special agents, who entered the apartment complex grounds in his vehicle, was injured when he was either struck by a gunfire or shrapnel, officials said. His injury was non life-threatening and was treated at the scene.

Another DPS special agent returned fire at the suspects. The suspects then fled the scene and barricaded themselves in an apartment at the complex.

Here's the scene on North Vista, in North Harris County. Dozens of law enforcement officers on scene, and a DPS helicoper is above. It’s unclear if anyone is inside with the barricaded suspect. SWAT is arriving now. #khou11pic.twitter.com/w89NBuhfbl